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The area of a trapezoid can be calculated using the formula: A = (a + b) * h / 2, where a and b are the lengths of the top and bottom bases, and h is the perpendicular height.
In this case, the top base (a) is 20 feet, the bottom base (b) is 30 feet, and the height (h) is 8 feet.
Therefore, the area of the trapezoid is: A = (20 + 30) * 8 / 2 = 50 * 8 / 2 = 400 ft²
The correct answer is 400 ft.².